I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What has to be broken before you can use it?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What always comes into a house through the keyhole?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?